Studi komparatif terkait kedudukan hukum nota kesepahaman memorandum of understanding sebagai pra kontrak berdasarkan buku iii kuhperdata dan doktrin promissory estoppel di Inggris dan Amerika Serikat = A comparative study regarding legal standing of memorandum of understanding as pre contract based on book iii of Indonesian civil code and doctrine promissory estoppel in England and United States of America / Putri Athira